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PartsTable / COMPONENT / MS39256-4B128
MS39256-4B128 ✓ Verified by PartsTable
— · COMPONENT
WHAT YOU NEED TO KNOW
Verify manufacturer and server generation compatibility Check if Option PN or Spare PN — same part, different channel
Confirm exact part number — similar PNs may be different parts
PRODUCT OVERVIEW

THERMAL RELEASE,CIRCUIT BREAKER. Key specifications include material: FIBER AND RUBBER BODY, performance_type: STANDARD CAPACITY, style_designator: PLAIN, nominal_pitch_length: 129.800 INCHES IN, strengthening_feature: FIBER CORD. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3030-00-640-4355, indicating validated use in U.S.

government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
MS39256-4B128
NSN: 3030-00-640-4355
FSC: 3030
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialFIBER AND RUBBER BODY
belt_quantity4
style_designatorPLAIN
cross-sectional_sizeB
nominal_pitch_length129.800 INCHES IN
strengthening_featureFIBER CORD
NSN3030-00-640-4355
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available THERMAL RELEASE,CIRCUIT BREAKER TITLE COMPONENT PN MS39256-4B128 MFR THERMAL RELEASE,CIRCUI
KEY FEATURES
•
PERFORMANCE TYPE: STANDARD CAPACITY
•
NOMINAL PITCH LENGTH: 129.800 INCHES IN
•
MATERIAL: FIBER AND RUBBER BODY
•
BELT QUANTITY: 4
•
CROSS-SECTIONAL SIZE: B
•
STYLE DESIGNATOR: PLAIN
•
STRENGTHENING FEATURE: FIBER CORD
TECHNICAL CHARACTERISTICS (FLIS)
PERFORMANCE TYPESTANDARD CAPACITY
NOMINAL PITCH LENGTH129.800 INCHES IN
MATERIALFIBER AND RUBBER BODY
BELT QUANTITY4
CROSS-SECTIONAL SIZEB
STYLE DESIGNATORPLAIN
STRENGTHENING FEATUREFIBER CORD
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
42420-251Interchangeable
interchangeable cross-reference
interchangeable
B12-8Interchangeable
interchangeable cross-reference
interchangeable
B12.8Interchangeable
interchangeable cross-reference
interchangeable
052643Interchangeable
interchangeable cross-reference
interchangeable
1134-7Interchangeable
interchangeable cross-reference
interchangeable
12Z10023-10Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS39256-4B128?
MS39256-4B128 is a THERMAL RELEASE,CIRCUIT BREAKER.
What parts can replace MS39256-4B128?
There are 21 known substitutes for MS39256-4B128: 42420-251, B12-8, B12.8 and 18 more. Substitute compatibility should be verified for your specific system.
Is MS39256-4B128 still available?
MS39256-4B128 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026